Abstract
Motivated by integrability of the sine-Gordon equation, we investigate a technique for constructing desired solutions to Einstein’s equations by combining a dressing technique with a control-theory approach. After reviewing classical integrability, we recall two well-known Killing field reductions of Einstein’s equations, unify them using a harmonic map formulation, and state two results on the integrability of the equations and solvability of the dressing system. The resulting algorithm is then combined with an asymptotic analysis to produce constraints on the degrees of freedom arising in the solution-generation mechanism. The approach is carried out explicitly for the Einstein vacuum equations. Applications of the technique to other geometric field theories are also discussed.
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Notes
- 1.
The term integrable has been adopted in various contexts, and is ambiguous in characterizing the features of such an equation (e.g., existence of closed-form solutions by quadrature, possessing infinitely many conservation laws, exhibiting solitonic dynamics, etc.). We shall restrict our attention to those equations which are integrable in the Lax sense.
- 2.
It is a long-standing open problem to characterize the PDEs which admit a Lax formulation.
- 3.
It also hinges on space being non-compact and one dimensional.
- 4.
Although one is no longer considering an eigenvalue problem in the classical sense, λ is often still called a spectral parameter.
- 5.
Using the transformation \(x =\zeta +\eta,t =\zeta -\eta\), one may easily recover the second recognizable form of the sine-Gordon equation, \(u_{\mathit{xx}} - u_{\mathit{tt}} =\sin u\).
- 6.
Asymptotically flat solutions represent vacuum outside an isolated body.
- 7.
The sine-Gordon equation can also be put into this framework, see [22].
- 8.
The metric is Riemannian if G is a compact group.
- 9.
Note that by virtue of the Cartan embedding, a symmetric space can be embedded into a Lie group, for which one may choose a matrix representation, thus making addition and scalar multiplication of elements possible.
- 10.
In particular the pseudo-unitary groups SU(p, q) satisfy this assumption. Moreover, groups possessing Dynkin diagrams with no symmetries may also qualify. Modification of this procedure to address other families of involutions will be taken up in a future work.
- 11.
- 12.
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Acknowledgements
SB gratefully acknowledges support from M. Kiessling and the NSF through grant DMS-0807705, during which the first part of this project was conceived; this material is also based upon work supported by the NSF under Grant #0932078000, while SB was in residence at the Mathematical Science Research Institute in Berkeley, California, during the 2013 Autumn semester. STZ thanks the Institute for Advanced Study for their hospitality and the stimulating environment provided during Spring 2011 while the authors were working on this project.
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Beheshti, S., Tahvildar-Zadeh, S. (2014). Dressing with Control: Using Integrability to Generate Desired Solutions to Einstein’s Equations. In: Cuevas-Maraver, J., Kevrekidis, P., Williams, F. (eds) The sine-Gordon Model and its Applications. Nonlinear Systems and Complexity, vol 10. Springer, Cham. https://doi.org/10.1007/978-3-319-06722-3_9
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